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Factorio's endgame isn't to launch a rocket.
It's to get bots, expand your botnet, and have the bots launch a rocket for you.
Sure, you can get a tank.
But aiming is sooo much work. Why not equip 2 shields, 2 automatic laser turrets, a fusion reactor, and become a tank yourself?
Or better yet, just keep expanding your botnet and have your defender bots take care of that for you?